How long does it take for your high e string to lose its intonation?

[wintermoon]

I don't get intonation problems, Once the high E and B get a little rough feeling I'll swap them out and when they get rough the whole set gets changed.

[Cunamara]

My e string appears to go a little flat around the twelfth fret after about one week.

That’s around 14 hours of play. I don’t clean my strings and I use thomastik 12s.
I was curious, how long does the intonation of other people’s e strings last?

Are you testing this by ear or with a tuner that will read out in cents sharp or flat?

[Llamadave]

Are you testing this by ear or with a tuner that will read out in cents sharp or flat?

Polytune tuner. Always perfect with new strings. But then out by a few cents after above twelfth.

[Vladan]

I’m also in the “this has never happened to me” group. Any intonation problems have been fixed with bridge or nut adjustments.

[Woody Sound]

Some people's skin chemistry affects strings more quickly than others, though.

When I was in college there was another guitar student, and nobody would let her play their guitars. Her body chem was so strong that the wound classical strings would go dead after a few minutes. During a master class, recital, or lesson, her classical guitar ended up sounding like a dark thunky ES175. Nicest woman ever, btw.

[Marinero]

"My assumption, which I offer without proof, is that the string becomes kinked where it touches the frets."
rpjazzguitar

Hi, RP,
A simple litmus test on my CG strings is to run my fingernail under the nylon trebles to feel for string deformation at the fret. This is usually associated with intonation problems. A close analogy might also include EG steel strings.
Marinero